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998

Appendix V

The problem becomes :—given a shaft whose

(a)  Maximum Tm = 171,000 Ib.ins.
To make this condition satisfy simultaneously

(b)  Maximum stress = 9000 Ibs. per sq. in.

(c)  Maximum angle of torsion = i degree in 20 ft.

which it is impossible to satisfy fully.   Taking (a] and (b)

1    "4-57" 6-4-8"

DIAME.TE.R    OF SHAFT

19

Taking (£) and (^), as in Example 21, p. 425, with / = 240",

7 x 36°

13,000,000